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Scallop Genome Provides Insights Into Evolution of Bilaterian Karyotype and Development

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Scallop Genome Provides Insights Into Evolution of Bilaterian Karyotype and Development ARTICLES PUBLISHED: 3 APRIL 2017 | VOLUME: 1 | ARTICLE NUMBER: 0120 Scallop genome provides insights into evolution of bilaterian karyotype and development Shi Wang1, 2 †, Jinbo Zhang3 †, Wenqian Jiao1 †, Ji Li3 †, Xiaogang Xun1 †, Yan Sun1 †, Ximing Guo4 †, Pin Huan5 †, Bo Dong1, 2, Lingling Zhang1, Xiaoli Hu1, 6, Xiaoqing Sun3, Jing Wang1, Chengtian Zhao7, Yangfan Wang1, Dawei Wang3, Xiaoting Huang1, Ruijia Wang1, Jia Lv1, Yuli Li1, Zhifeng Zhang1, Baozhong Liu5, Wei Lu1, Yuanyuan Hui3, Jun Liang8, Zunchun Zhou9, Rui Hou1, Xue Li1, Yunchao Liu3, Hengde Li1, 10, Xianhui Ning1, Yu Lin3, Liang Zhao1, Qiang Xing1, Jinzhuang Dou1, Yangping Li1, Junxia Mao1, Haobing Guo1, Huaiqian Dou1, Tianqi Li1, Chuang Mu1, Wenkai Jiang3, Qiang Fu1, Xiaoteng Fu1, Yan Miao1, Jian Liu3, Qian Yu1, Ruojiao Li1, Huan Liao1, Xuan Li1, Yifan Kong1, Zhi Jiang3, Daniel Chourrout11*, Ruiqiang Li3* and Zhenmin Bao1, 6* Reconstructing the genomes of bilaterian ancestors is central to our understanding of animal evolution, where knowledge from ancient and/or slow-evolving bilaterian lineages is critical. Here we report a high-quality, chromosome-anchored reference genome for the scallop Patinopecten yessoensis, a bivalve mollusc that has a slow-evolving genome with many ancestral fea- tures. Chromosome-based macrosynteny analysis reveals a striking correspondence between the 19 scallop chromosomes and the 17 presumed ancestral bilaterian linkage groups at a level of conservation previously unseen, suggesting that the scallop may have a karyotype close to that of the bilaterian ancestor. Scallop Hox gene expression follows a new mode of subcluster temporal co-linearity that is possibly ancestral and may provide great potential in supporting diverse bilaterian body plans. Transcriptome analysis of scallop mantle eyes finds unexpected diversity in phototransduction cascades and a potentially ancient Pax2/5/8-dependent pathway for noncephalic eyes. The outstanding preservation of ancestral karyotype and develop- mental control makes the scallop genome a valuable resource for understanding early bilaterian evolution and biology. he nature of Urbilateria, the last common ancestor of all bilat- Mollusca is the most speciose phylum of Lophotrochozoa and erians, is enigmatic due to the lack of a plausible candidate in among the first bilaterians to appear in fossil records6. Many mol- Tthe fossil records1. The earliest unambiguous fossil of a bilat- luscan lineages including bivalves showed little change in shell erian, Kimberella, shows remarkable resemblance to a mollusc, albeit morphology and life style over several hundred million years, and its relationship with Urbilateria remains uncertain2,3. In the absence yet extant molluscs are abundant and thriving in diverse marine, of definitive fossil records, genomic reconstruction by comparing freshwater and terrestrial environments, providing key ecological extant bilaterian genomes becomes essential to our understanding of services and significant economic benefits to humans. Molluscs early bilaterian ancestors and their subsequent evolution4,5. However, are highly diverse in form, making them excellent subjects to study reconstructing the genome of the bilaterian ancestor is challenging body plan evolution and in particular its patterning by Hox genes7. due to the paucity of high-order genome assemblies from ancient Molluscs also have the greatest diversity in eye morphology, ranging and/or slow-evolving lineages. Early genome sequencing efforts from simple cupped to chambered or compound eyes, as well as in have mostly focused on two of the three major bilaterian groups, that the number and placement of their eyes8, providing good subjects is, protostome ecdysozoans and deuterostomes. Limited sequencing to study the origin and evolution of the eye, or Darwin’s ‘organ of in the third group of protostome lophotrochozoans, a large super- extreme perfection’. Despite the great evolutionary and biological clade that includes molluscs, annelids and brachiopods, has revealed significance of molluscs, our sampling of their genomes remains that their genomes are less derived from the ancestral bilaterian state limited to a few species5,9–11 and without high-order assemblies. than those of many ecdysozoans5. Unfortunately, none of these less- Here we report a high-quality, chromosome-anchored reference derived lophotrochozoan genomes were assembled to a degree that genome of the scallop Patinopecten yessoensis (Jay, 1857), a bivalve permits chromosome-level genome comparison. mollusc from the large Pectinidae family that contains ~270 living 1Key Laboratory of Marine Genetics and Breeding (Ocean University of China), Ministry of Education, Qingdao 266003, China. 2Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China. 3Novogene Bioinformatics Institute, Beijing 100083, China. 4Haskin Shellfish Research Laboratory, Department of Marine and Coastal Sciences, Rutgers University, Port Norris, New Jersey 08349, USA. 5Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. 6Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China. 7Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao 266003, China. 8Dalian Zhangzidao Group Co. Ltd, Dalian 116001, China. 9Liaoning Key Lab of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China. 10Key Laboratory of Aquatic Genomics, Ministry of Agriculture, Chinese Academy of Fishery Sciences, Beijing 100141, China. 11Sars International Centre for Marine Molecular Biology, University of Bergen, Bergen N-5008, Norway. †These authors contributed equally to this work. *e-mail: [email protected]; [email protected]; [email protected] NATURE ECOLOGY & EVOLUTION 1, 0120 (2017) | DOI: 10.1038/s41559-017-0120 | www.nature.com/natecolevol 1 © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. ARTICLES NATURE ECOLOGY & EVOLUTION species and thousands of fossil species (dating back to ~320–340 and a scaffold N50 size of 804 kb (Supplementary Table 2), rep- million years ago, Ma12). Scallops are widely distributed in world resenting significant improvements over two published bivalve oceans. They are mostly free-living and have multiple eyes scatter- genomes9,11. Our assembly is 442 Mb less than the estimated genome ing along the mantle edge. Many scallops are important fishery and size (~1.43 Gb; Supplementary Figs 8 and 9), probably due to the aquaculture species. P. yessoensis is a large scallop living on cold and collapse of repetitive elements (Supplementary Fig. 10). The quality stable ocean bottoms of the northwestern Pacific. It has a conserved and integrity of the assembly is demonstrated by the mapping of 19-chromosome karyotype that is common to diverse bivalves and 94.5% paired-end reads, 99.8% of Sanger-sequenced fosmids and may represent the ancient karyotype of bivalves13. Analysis of the 96.0–99.8% of various transcriptomic datasets generated in this and scallop genome and extensive transcriptomes reveals outstanding a previous study15 (Supplementary Figs 11 and 12; Supplementary preservation of ancestral bilaterian linkage groups, an intact Hox Tables 3–6). With the aid of a high-density linkage map (7,489 gene cluster under new expression control and diverse phototrans- markers; Supplementary Table 7) constructed by using the 2b-RAD duction cascades with a potentially ancient Pax2/5/8-dependent methodology16, 1,419 scaffolds (covering ~81% of the assembly) are pathway for noncephalic eye formation, providing insights into the assigned to the 19 haploid chromosomes (Fig. 1a; Supplementary evolution of genome organization and developmental control dur- Fig. 13), providing the first chromosome-anchored genome assem- ing the emergence of bilaterians. bly in molluscs or less-derived lophotrochozoans. The scallop genome encodes 26,415 protein-coding genes Results and discussion (Supplementary Figs 14 and 15; Supplementary Table 8), of which Genome sequencing, assembly and characterization. Genomes 91% are annotated based on known proteins in public databases of marine bivalves are particularly challenging to sequence and (Supplementary Table 9). The repeat content accounts for 39% assemble with short next-generation sequencing reads due to high (389 Mb) of the assembly (Supplementary Table 10), dominated by polymorphism and repetitive content9,11. To alleviate the polymor- tandem repeats (18.4%). Transposable elements, which are usually phism problem, a highly inbred individual derived from selfing of a considered active modulators of genome evolution, are less abundant hermaphrodite (inbreeding coefficient of 0.5; Supplementary Fig. 1; (8–18% reduction) and less active in the scallop genome than the Fig. 1a) was used for whole-genome shotgun (WGS) sequencing Pacific oyster and pearl oyster genomes (Supplementary Table 10; (424.3 Gb data in total; Supplementary Table 1), and an efficient, Supplementary Fig. 16). Resequencing of the wild hermaphrodite hybrid-specific SOAPdenovo approach14 was adopted for genome parent provides a genome-wide single nucleotide polymorphism assembly (see Supplementary Text; Supplementary Figs 2–7). The (SNP) and short insertion/deletion (indel) polymorphism level of final genome assembly is 988 Mb, with a contig N50 size of 38 kb 1.04% (Supplementary Table 11), which is lower than the 1.30% a Chr19 b Chr18 20 Mb Chr1 0 Mb 20 Mb P. yessoensis Chr17 0 Mb 20 Mb 0 Mb 1 40 Mb 2,257 20 Mb 0 Mb Chr2 2 20 Mb Chr16 0 Mb 3 20 Mb 40 Mb 1,284 1,307 4 0 Mb 0 Mb 9,365 5 20 Mb Chr3 Chr15 20 Mb 1,632 2,104 6 40 Mb 1,186 0 Mb 0 Mb C. gigas P. fucata 20 Mb Chr14 20 Mb Chr4 40 Mb 0 Mb 40 Mb 0 Mb c 9,000 Deuterostome Ecdysozoan 20 Mb 20 Mb 7,500 Chr13 Chr5 Non-bilaterian 0 Mb 40 Mb 6,000 40 Mb 0 Mb 4,500 20 Mb 20 Mb 3,000 Chr12 0 Mb 40 Mb Chr6 0 Mb 40 Mb Gene family number 1,500 20 Mb 20 Mb 0 40 Mb 0 Mb 0 Mb 20 Mb Chr7 Chr11 40 Mb 0 Mb 40 Mb 20 Mb C. gigas P. fucata C. teleta 0 Mb L. anatina H.
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